Johan Pansu

Johan Pansu
Claude Bernard University Lyon 1 | UCBL

PhD

About

45
Publications
28,663
Reads
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1,858
Citations
Citations since 2016
29 Research Items
1709 Citations
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
Additional affiliations
January 2015 - December 2015
University Grenoble Alpes
Position
  • ATER
January 2014 - present
University Joseph Fourier - Grenoble 1
Position
  • Lecturer
October 2011 - December 2014
University Joseph Fourier - Grenoble 1
Position
  • PhD

Publications

Publications (45)
Article
Full-text available
Ecological niche differences are necessary for stable species coexistence but are often dif- ficult to discern. Models of dietary niche differentiation in large mammalian herbivores invoke the quality, quantity, and spatiotemporal distribution of plant tissues and growth forms but are agnostic toward food plant species identity. Empirical support f...
Article
Full-text available
Amidst global shifts in the distribution and abundance of wildlife and livestock, we have only a rudimentary understanding of ungulate parasite communities and parasite-sharing patterns. We used qPCR and DNA metabarcoding of fecal samples to characterize gastrointestinal nematode (Strongylida) community composition and sharing among 17 sympatric sp...
Article
Full-text available
Sympatric large mammalian herbivore species differ in diet composition, both by eating different parts of the same plant and by eating different plant species. Various theories proposed to explain these differences are not mutually exclusive, but are difficult to reconcile and confront with data. Moreover, whereas several of these ideas were origin...
Article
Full-text available
Equids are chronically infected with parasitic strongyle nematodes. There is a rich literature on horse strongyles, but they are difficult to identify morphologically and genetic studies on strongyles infecting other equid species are few, hampering studies of host specificity. We sequenced expelled worms from two sympatric zebra species in central...
Article
Full-text available
Major disturbances can temporarily remove factors that otherwise constrain population abundance and distribution. During such windows of relaxed top-down and/or bottom-up control, ungulate populations can grow rapidly, eventually leading to resource depletion and density-dependent expansion into less-preferred habitats. Although many studies have e...
Article
Full-text available
Earthworms are an important soil taxon as ecosystem engineers, providing a variety of crucial ecosystem functions and services. Little is known about their diversity and distribution at large spatial scales, despite the availability of considerable amounts of local-scale data. Earthworm diversity data, obtained from the primary literature or provid...
Article
Full-text available
Earthworms are an important soil taxon as ecosystem engineers, providing a variety of crucial ecosystem functions and services. Little is known about their diversity and distribution at large spatial scales, despite the availability of considerable amounts of local-scale data. Earthworm diversity data, obtained from the primary literature or provid...
Article
Full-text available
Spatially overdispersed mounds of fungus‐farming termites (Macrotermitinae) are hotspots of nutrient availability and primary productivity in tropical savannas, creating spatial heterogeneity in communities and ecosystem functions. These termites influence the local availability of nutrients in part by redistributing nutrients across the landscape,...
Article
Full-text available
Trophic rewilding seeks to rehabilitate degraded ecosystems by repopulating them with large animals, thereby re-establishing strong top-down interactions. Yet there are very few tests of whether such initiatives can restore ecosystem structure and functions, and on what timescales. Here we show that war-induced collapse of large-mammal populations...
Poster
Full-text available
Swamp environments are ecologically important areas found throughout the world. These ecosystems carry out essential services which support life on Earth, including; nutrient cycling, carbon sequestration and hydrological functions. For these services to function correctly they depend on a healthy diversity of plant, animal and microbial life. With...
Article
Full-text available
Soil organisms, including earthworms, are a key component of terrestrial ecosystems. However, little is known about their diversity, their distribution, and the threats affecting them. We compiled a global dataset of sampled earthworm communities from 6928 sites in 57 countries as a basis for predicting patterns in earthworm diversity, abundance, a...
Article
Full-text available
Soil organisms, including earthworms, are a key component of terrestrial ecosystems. However, little is known about their diversity, their distribution, and the threats affecting them. We compiled a global dataset of sampled earthworm communities from 6928 sites in 57 countries as a basis for predicting patterns in earthworm diversity, abundance, a...
Data
This PDF file includes: Materials and Methods Supplementary Text Figs. S1 to S6 Tables S1 to S4 References
Article
Full-text available
Soil organisms, including earthworms, are a key component of terrestrial ecosystems. However, little is known about their diversity, their distribution, and the threats affecting them. We compiled a global dataset of sampled earthworm communities from 6928 sites in 57 countries as a basis for predicting patterns in earthworm diversity, abundance, a...
Article
Full-text available
Soil organisms, including earthworms, are a key component of terrestrial ecosystems. However, little is known about their diversity, their distribution, and the threats affecting them. We compiled a global dataset of sampled earthworm communities from 6928 sites in 57 countries as a basis for predicting patterns in earthworm diversity, abundance, a...
Data
This PDF file includes: Materials and Methods Supplementary Text Figs. S1 to S6 Tables S1 to S4 References
Data
This PDF file includes: Materials and Methods Supplementary Text Figs. S1 to S6 Tables S1 to S4 References
Data
This PDF file includes: Materials and Methods Supplementary Text Figs. S1 to S6 Tables S1 to S4 References
Data
This PDF file includes: Materials and Methods Supplementary Text Figs. S1 to S6 Tables S1 to S4 References
Article
Full-text available
Soil microbial communities play a key role in ecosystem functioning but still little is known about the processes that determine their turnover (β‐diversity) along ecological gradients. Here, we characterize soil microbial β‐diversity at two spatial scales and at multiple phylogenetic grains to ask how archaeal, bacterial and fungal communities are...
Article
Full-text available
Ecosystems feel war's effects War ravages human lives and landscapes, but nonhuman victims are no less affected. The Mozambican Civil War resulted in the rapid decline of predators in Gorongosa National Park and led to a trophic cascade that shifted prey behaviors and plant communities. Atkins et al. monitored this shift and found that the absence...
Article
Full-text available
1.Crop raiding by wildlife poses major threats to both wildlife conservation and human wellbeing in agro‐ecosystems worldwide. These threats are particularly acute in many parts of Africa, where crop raiders include globally threatened megafauna such as elephants, and where smallholder agriculture is a primary source of human livelihood. One framew...
Article
Full-text available
1. Diverse megafauna assemblages have declined or disappeared throughout much of the world, and many efforts are underway to restore them. Understanding the trophic ecology of such reassembling systems is necessary for predicting recovery dynamics, guiding management, and testing general theory. Yet there are few studies of recovering large‐mammal...
Article
Full-text available
Investigating how trophic interactions influence the β-diversity of meta-communities is of paramount importance to understanding the processes shaping biodiversity distribution. Here, we apply a statistical method for inferring the strength of spatial dependencies between pairs of species groups. Using simulated community data generated from a mult...
Article
Full-text available
During the late nineteenth century, Europeans introduced rabbits to many of the sub-Antarctic islands, environments that prior to this had been devoid of mammalian herbivores. The impacts of rabbits on indigenous ecosystems are well studied; notably, they cause dramatic changes in plant communities and promote soil erosion. However, the responses o...
Article
Full-text available
Paleoenvironmental studies are essential to understand biodiversity changes over long timescales and to assess the relative importance of anthropogenic and environmental factors. Sedimentary ancient DNA (sedaDNA) is an emerging tool in the field of paleoecology and has proven to be a complementary approach to the use of pollen and macroremains for...
Presentation
Paleoenvironmental studies provides crucial long-term data to study both anthropogenic disturbance and/or climate changes, and their effects on the environment. We used a multi-disciplinary approach to reconstruct past landscapes in Lake Anterne watershed (Haute-Savoie, French Alps) over the Holocene. In a previous study, DNA metabarcoding approach...
Article
Full-text available
L'article proposé ici présente les résultats d'un outil en plein essor, l'ADN sédimentaire lacustre appliqué à la reconstitution de l'histoire des activités agricoles et des paysages (ADN des plantes et des mammifères) dans les Alpes françaises. étant donné le caractère novateur de l'outil, une partie de l'article est aussi consacrée à une réflexio...
Article
Full-text available
L'article proposé ici présente les résultats d'un outil en plein essor, l'ADN sédimentaire lacustre appliqué à la reconstitution de l'histoire des activités agricoles et des paysages (ADN des plantes et des mammifères) dans les Alpes françaises. étant donné le caractère novateur de l'outil, une partie de l'article est aussi consacrée à une réflexio...
Thesis
Full-text available
Most ecosystems undergo an increasing anthropogenic pressure. Studies about the effects of human activities on biodiversity are proliferating but they focus on few taxonomical groups, mainly for methodological reasons. The originality of this work is based on the application of an approach based on environmental DNA that allows access to the biodiv...
Thesis
La plupart des écosystèmes sont aujourd'hui soumis à une pression anthropique croissante. Les études portant sur l'effet des activités humaines sur la biodiversité se multiplient mais elles se focalisent, principalement pour des raisons méthodologiques, sur un nombre restreint de groupes taxonomiques. L'originalité de ces travaux repose sur l'appli...
Article
Environmental DNA (eDNA) metabarcoding is increasingly used to study present and past biodiversity. eDNA analyses often rely on amplification of very small quantities or degraded DNA. To avoid missing detection of taxa that are actually present (false negatives), multiple extractions and amplifications of the same samples are often performed. Howev...
Presentation
Full-text available
We present the transposition of an innovative ecological tool, DNA metabarcoding, to paleosciences in the aim of reconstructing past vegetation dynamics and agro-pastoral activities in relation with the evolution of erosion patterns in Alpine areas. DNA metabarcoding was applied on extra-cellular DNA from mammals (mitochondrial DNA) and plants (chl...
Article
Full-text available
The reconstruction of human-driven, Earth-shaping dynamics is important for understanding past human/environment interactions and for helping human societies that currently face global changes. However, it is often challenging to distinguish the effects of the climate from human activities on environmental changes. Here we evaluate an approach base...
Presentation
L’homme est aujourd’hui reconnu comme un agent géologique majeur en raison des impacts multiples de ses activités sur les différents compartiments du système Terre1. Son empreinte sur l’environnement s’est considérablement accentuée il y a 10 000 à 7 000 ans avec la généralisation de l’agro-pastroralisme. De nombreuses études ont été éffectuées à p...
Poster
Full-text available
We present the transposition of an innovative ecological tool, DNA barcoding (Valentini et al., 2009), to paleosciences in the aim of reconstructing past vegetation dynamics and human land-use in relation with the evolution of erosion patterns in Alpine areas. DNA barcoding was applied on extra-cellular DNA from mammals (mitochondrial DNA) and plan...
Poster
Full-text available
Here we propose to use a new proxy, DNA barcoding, to reconstruct human activities and plant cover evolution, in order to better characterise human-climate-environment interactions from lake sediments. Extra-cellular DNA from mammals and plants is preserved in lake sediments, bind to clays, sands, humic substance and organomineral complexes. The me...
Article
Full-text available
Cattle, sheep and goats were domesticated about 10,000 years ago, spread out of the domestication centers in Europe, Asia, and Africa during the next few thousands years, and gave many populations locally adapted. After a very long period of soft selection, the situation changed dramatically 200 years ago with the emergence of the breed concept. Th...

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